Observation of Z_{b}(10610) and Z_{b}(10650) Decaying to B Mesons.

A Garmash,A Abdesselam, I Adachi,H Aihara,D M Asner,T Aushev,R Ayad,T Aziz,V Babu,I Badhrees,A M Bakich,P Behera,V Bhardwaj,B Bhuyan,A Bobrov,A Bondar,G Bonvicini, A Bozek,M Bračko,T E Browder,D Červenkov,V Chekelian,A Chen,B G Cheon,K Chilikin,K Cho,V Chobanova,Y Choi,D Cinabro,J Dalseno,M Danilov,N Dash,Z Doležal,A Drutskoy,D Dutta,S Eidelman,D Epifanov,H Farhat,J E Fast,T Ferber, B G Fulsom,V Gaur,N Gabyshev,R Gillard,Y M Goh, P Goldenzweig,B Golob,T Hara, K Hayasaka, H Hayashii, T Iijima,A Ishikawa,R Itoh, Y Iwasaki, I Jaegle,D Joffe,K K Joo,T Julius,K H Kang,E Kato, T Kawasaki,D Y Kim,J B Kim,K T Kim,M J Kim,S H Kim,Y J Kim,K Kinoshita, S Korpar,P Križan,P Krokovny,T Kuhr,A Kuzmin,Y-J Kwon, J S Lange,I S Lee,C Li,H Li,L Li,L Li Gioi,J Libby,D Liventsev,P Lukin, M Masuda,D Matvienko,K Miyabayashi,H Miyata,R Mizuk, G B Mohanty,A Moll, T Mori,R Mussa, E Nakano, M Nakao,T Nanut,Z Natkaniec,S Nishida,S L Olsen,P Pakhlov,G Pakhlova, B Pal,H Park, T K Pedlar, R Pestotnik, M Petrič,L E Piilonen, C Pulvermacher, E Ribežl,M Ritter,A Rostomyan,H Sahoo, Y Sakai,S Sandilya,T Sanuki, V Savinov,O Schneider, G Schnell, C Schwanda, Y Seino, D Semmler,K Senyo, I S Seong,M E Sevior, V Shebalin, C P Shen,T-A Shibata,J-G Shiu,B Shwartz,F Simon,Y-S Sohn,E Solovieva, M Starič,T Sumiyoshi,U Tamponi,K Tanida,Y Teramoto,K Trabelsi,M Uchida, S Uehara,T Uglov,S Uno,C Van Hulse, P Vanhoefer, G Varner,V Vorobyev, M N Wagner,C H Wang,M-Z Wang,P Wang, Y Watanabe,K M Williams,E Won,H Yamamoto,J Yamaoka, S Yashchenko,J Yelton, Y Yook,C Z Yuan, Z P Zhang,V Zhilich,V Zhulanov, A Zupanc

PHYSICAL REVIEW LETTERS（2016）

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摘要

We report the analysis of the three-body e(+)e(-) -> B (B) over bar pi(+/-), B (B) over bar*pi(+/-), and B*(B) over bar* pi(+/-) processes, including the first observations of the Z(b)(+/-)(10610) -> [B (B) over bar* + c.c.](+/-) and Z(b)(+/-)(10650) -> [B*(B) over bar*](+/-) transitions that are found to dominate the corresponding final states. We measure Born cross sections for the three-body production of sigma(e(+)e(-) -> [B (B) over bar* + c.c.](+/-)pi(-/+)) = [17.4 +/- 1.6(stat) +/- 1.9(syst)]pb and sigma(e(+)e(-) -> [B*(B) over bar*](+/-)pi(-/+)) = [8.75 +/- 1.15(stat) +/- 1.04(syst)] pb and set a 90% C.L. upper limit of sigma(e(+)e(-) -> [B (B) over bar](+/-)pi(-/+)) < 2.9 pb. The results are based on a 121.4 fb(-1) data sample collected with the Belle detector at a center-of-mass energy near the Upsilon(10860) peak.

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